2. Cell Chemistry & Cell Components
Nucleic Acids
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Practice this topic
- Multiple Choice
Which of the following descriptions best fits the class of molecules known as nucleotides?
a) A nitrogenous base & a phosphate group.
b) A nitrogenous base & a sugar.
c) A nitrogenous base, phosphate group & a sugar.
d) A nitrogenous base, a carbohydrate, & a sugar.
- Multiple Choice
The four nitrogenous bases commonly found if DNA are:
a) Adenine, thymine, cytosine, uracil
b) Uracil, adenine, cytosine, guanine.
c) Uracil, cytosine, guanine, thymine.
d) Adenine, thymine, cytosine, guanine.
e) None are correct.
- Multiple Choice
Which of the following statements about DNA structure is true?
a) The nucleic acid strands in a DNA molecule are oriented antiparallel to each other.
b) Nucleic acids are formed through phosphodiester bonds that link complementary nucleobases together.
c) Hydrogen bonds formed between the sugar-phosphate backbones of the two DNA chains stabilize the structure.
d) The pentose sugar in DNA is ribose (containing two hydroxyl groups).
- Multiple ChoiceA glucose molecule is to starch as __________.
- Open QuestionWhat are the four nitrogenous bases found in RNA?a. cytosine, guanine, thymine, uracil (C, G, T, U)b. adenine, cytosine, guanine, thymine (A, C, G, T)c. adenine, cytosine, guanine, uracil (A, C, G, U)d. alanine, cysteine, glycine, threonine (A, C, G, T)
- Open QuestionWhat determines the primary structure of a DNA molecule?a. stem-and-loop configurationb. complementary base pairingc. deoxyribonucleotide sequenced. hydrophobic interactions and hydrogen bonding
- Open QuestionEvaluate the following statements related to the synthesis of nucleic acids. Select True or False for each statement.T/F Ribonucleotides are added to the 3′ end of a DNA strand.T/F Polymerization of nucleic acids occurs by the formation of phosphodiester bonds.T/F Complementary pairing between sugars is required for copying nucleic acids.T/F Strands in a double helix are synthesized in an antiparallel orientation.
- Open QuestionSingle strands of nucleic acids are directional, meaning that there are two different ends. What functional groups define the two different ends of a strand?